a chemsit has a 70ml of 50% methane solution. how much of an 80% solution must she add to get a 60% solution

Answer:

Approximately 8.8 grams of solid KNO3 will precipitate from the solution when it's cooled from 50 degrees Celsius to 20 degrees Celsius.

Explanation:

The solubility of a solid in a liquid typically decreases as the temperature decreases. As a result, when a saturated solution is cooled, some of the solid may precipitate out of the solution.

The solubility of potassium nitrate (KNO3) in water at 20 degrees Celsius is around 42 grams per 100 milliliters of water. At 50 degrees Celsius the solubility is around 86 grams per 100 milliliters of water.

To find the mass of solid that will precipitate, we can use the difference between the solubility of KNO3 at 20 degrees Celsius and at 50 degrees Celsius.

At 20 degrees Celsius, the solubility of KNO3 is 42 g/100 mL, and at 50 degrees Celsius, the solubility is 86 g/100 mL.

So, the difference between the solubility of KNO3 at 20 degrees Celsius and at 50 degrees Celsius is 86 - 42 = 44 grams per 100 milliliters.

Since we have 20 mL of a saturated solution, we can calculate the mass of the precipitate by multiplying the difference in solubility by the volume of the solution:

44 g/100 mL * 20 mL = 8.8 grams.

So, approximately 8.8 grams of solid KNO3 will precipitate from the solution when it's cooled from 50 degrees Celsius to 20 degrees Celsius.

Please note that this is an approximate calculation and the actual amount of precipitate may vary depending on other factors such as impurities and the specific conditions of the experiment.

A solution by dissolving 10.8g of sodium sulphate (Na2SO4) in 100.0ml of water. Then add 10.00 ml of this solution to 50.00ml of water. The concentration of Na2SO4 is 0.012M (SO4)2- and 0.024M Na+.

Given the mass of sodium sulfate (na2so4) (m) = 10.8g = 10.8 x 10^-3kg

The volume of stock solution (V) =100ml = 0.1L

the extra volume added (V') = 10ml = 0.01L

The volume of water is (V'') = 50ml = 0.05L

We know that molarity = number of moles/volume of solution

Utilizing its molar mass, we should convert the provided mass of (Na2SO4) to moles.

10.8g 0f Na2SO4 x 1mol Na2SO4/142.04 = 0.076mol Na2SO4

Calculate the molarity of the solution by multiplying this amount by 100mL solution.

molarity = 0.076/0.1 = 0.76M

A total of 60mL of this solution is created by adding 10mL of it to 50mL of water. From dilution equation M1V1 = M2V2 to find the molality of 60mL solution.

(0.076) x (0.01) = M2 x (0.06)

M2 = 0.012M

This means that there are 0.012 moles of Na2SO4 per liter of solution. As it contains 2 Na+ and 1 (SO4)2- ions the concentrations of each ion is thus calculated as: 2 x 0.012 = 0.024M Na+ and 0.012M (SO4)2-.

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The correct balanced equation for the reaction between zinc and dihydrogen sulfate is:

Zn + H₂S -> ZnS + H₂ (Option C)

We can balance chemical equation by simply obeying the law of conservation of matter.

The law of conservation of matter which states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another.

Now, we shall write the balance equation as shown below:

Zinc + Dihydrogen sulfate ->

Zn + H₂S ->

Zinc displaces H to produce H₂ as shown below:

Zn + H₂S -> ZnS + H₂

Since the atoms of the elements on both sides of the equation are equal, then the equation is balanced

Thus, the correct answer is: Zn + H₂S -> ZnS + H₂ (Option C)

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If the hydrogen ion concentration in molarity (M) are known, it is possible to calculate the pH of the solution. A concentration of the h+ ions affects the pOH value, which can also be used to calculate the pH of a solution. The solution's pH value is 12.79.

Anything with a pH of 7.0 or below is acidic, & anything with a 7.0 or higher is alkaline or basic. There is a pH scale that lists all pH values for common materials and ranges from 0 (extremely acidic) to 14 (very basic/alkaline).

an evaluation of a substance's or solution's acidity or basicity. On a scale from 0 to 14, pH is calculated. The pH value of 7 represents neutral on this scale, i.e., no acidic nor basic. More basic substances have a pH value more than 7, whereas more acidic substances have a pH value less than 7.

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Nitric acid (HNO3) is a colorless, fuming, and extremely corrosive liquid with freezing and boiling points of 42 and 181 degrees Celsius, respectively. that is a popular laboratory reagent and an important industrial.

Neutralization is a chemical process that happens when an acid is put to a base. Nitric acid, HNO3, reacting with the basic potassium hydroxide, KOH, is one example.

Acids such as hydrochloric acid (H C l), nitric acid (H N O 3), and others exhibit an acidic nature as a result of their dissolution in aqueous solutions and generation of hydrogen ions. The acidic character of the compounds is caused by this hydrogen ion.

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Nitric acid (HNO3) has a freezing point of 42 degrees Celsius and a boiling point of 181 degrees Celsius. It is a whitish, fuming, and very corrosive liquid. It is a well-liked and crucial industrial reagent for laboratories.

When such an acid is added to a base, a chemical reaction called neutralization takes place. One example is the reaction of nitric acid (HNO3) and the basic potassium nitrate (KOH).

Because they dissolve in aqueous phase and produce hydrogen ions, acids like hcl (H C l), potassium nitrate (H 4-hydroxy N 3), and many others have an acidic character. This hydrogen ion is what gives the compounds their acidic nature.

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Since H2Se has the biggest molar mass of the gases, it has the lowest average velocity.

A substance's mass expressed in grams per mole is known as its molar mass. As seen in this video, the molar mass of a substance may be calculated by adding the molar masses of the material's component atoms.

Atomic mass is the mass of a single compound unit, whereas molecular mass refers to the mass of a single mole of a compound. In essence, atomic mass is the mass of the atom, while molar mass is the average mass of the compound's constituent parts.

Molar mass of H2Se = 78.98 + 2(1) = 80.98 g/mol

PH3 = 30.99758 + 3(1) = 33.99758 g/mol

C2H6 = 12(2)+6(1) = 30 g/mol

F2 = 37.997 g/mol

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Answer:

8.50 moles of Fe will produce 8.50 moles of FeS.

5.00 moles of Fe will produce 5.00 moles of Sb.

75.500 moles of FeS will require 88.150 grams of SbS.

14.885 grams of FeS will require 12.83 moles of Fe.

7.50 moles of SbS will require 37.50 grams of Fe.

Explanation:

Answer:

Diseases transmitted through the bites of infected animals are not considered contagious because they are not spread through direct contact with another person or through the air.

Explanation:

These diseases are typically caused by microorganisms or viruses that are specific to certain animal species, and they are not easily transmitted to humans. Additionally, many of these diseases require a specific set of circumstances to be transmitted, such as a bite or scratch from an infected animal, which makes them less likely to spread widely within a population. Contagious diseases are typically spread through direct contact with an infected person or through the air, such as through respiratory droplets from a sneeze or cough.

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The solution would contain 0.0084 mols of ions if 1.38 grams of sodium phosphate were dissolved in 50 mL of water.

In the International System of Units, the mole (symbol mol) is the unit of substance amount. The amount of substance is a measurement of how many elementary entities of a given substance are present in an object or sample. The mole is defined as having 6.022140761023 elementary entities. The mole concept is an easy way to express the amount of a substance. Any measurement is divided into two parts: the numerical magnitude and the units in which the magnitude is expressed. Due to the small size of atoms and molecules, the mole concept allows us to count atoms and molecules by weighing macroscopically small amounts of matter.

Here,

given mass=1.38 gram

molar mass,

=23*3+31*1+16*4

=69+31+64

=164 grams

moles=given mass/molar mass

=1.38/164

=0.0084 moles

If 1.38 grams of sodium phosphate were dissolved in 50 mL of water, the solution would contain 0.0084 mols of ions.

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The IUPAC name for the given compound is : 3-ethyl-4-methyl-3-hexen-1-ol

CH₃ - CH₂ - C = C - CH₂ - CH₃

                    |      |

                   CH₃  CH₂CH₂OH  

The given compound is :

CH₃ - CH₂ - C = C - CH₂ - CH₃

                    |      |

                   CH₃  CH₂CH₂OH  

The IUPAC name is 3-ethyl-4-methyl-3-hexen-1-ol.

The IUPAC name in the organic compound is the systematic approach for the naming of the organic compound. The IUPAC is the international union of the pure and the applied chemistry. There are some rule in the IUPAC to name the compounds. In the IUPAC on the naming of the compound the first rule is to find the longest chain of the carbon.

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Ar's partial pressure is 1.734 atm. if the gases neon, argon, and krypton are present in a sealed flask. If the flask's overall pressure is 3.782 atm, ne's partial pressure is 0.435 atm, and kr's partial pressure is 1.613 atm,

One of two methods can be used to compute partial pressures: 1) Use PV = nRT to calculate the individual pressure of each gas in a mixture. 2)Determine the proportion of pressure from the total pressure that may be assigned to each individual gas by using the mole fraction of each gas.

Each gas in a mixture adds to the overall pressure of the mixture. This portion represents the pressure. The pressure a gas would have if it were in its own volume and at its own temperature is known as the partial pressure.

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Number of moles of Nitrogen monoxide produced when 13 moles of of oxygen is reacted is 26 moles.

Dimensional analysis in chemical reaction means equating both sides of the equation and deriving relationships, so that we can calculate the required quantities.

Nitrogen and oxygen in the air, while events like lightening reacts together to form Nitrogen monoxide. The reaction is as follows.

    N₂  + O₂  ------- NO

By equating the reaction we get

      N₂  + O₂  -------  2NO

1 mole of nitrogen reacts with one mole of oxygen to get 2 moles of Nitrogen monoxide.

So when 13 moles of oxygen reacts 2× 13 moles of Nitrogen monoxide is formed. That is 26 moles.

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Answer: stronger

Explanation: At higher temperatures, Br2 takes more energy to break apart the molecules. Therefore, the intermolecular forces, most likely london dispersion, will need more energy. Cl2 has weaker forces and takes less to break it apart.

Answer: The equilibrium will shift to the right and the concentration of Ag+ (aq) will decrease, and the amount of AgCl(s) will increase.

Explanation: In the equilibrium equation AgCl(s) <--> Ag^+(aq) + Cl^-(aq) represents a system where AgCl is in equilibrium with its dissociated ions Ag+ and Cl- in aqueous solution. The equilibrium is established by the forward and reverse reactions, AgCl(s) dissociating into Ag+(aq) and Cl-(aq) and Ag+(aq) and Cl-(aq) recombining to form AgCl(s).

When the concentration of Cl- (aq) is increased, the equilibrium system will shift to the right to consume some of the added Cl-. This is known as Le Chatelier's principle, which states that if a stress is applied to a system at equilibrium, the system will shift in the direction that will tend to relieve that stress. In this case, the added Cl- ions will react with the Ag+ ions to form more AgCl(s) and decrease the concentration of Ag+ ions.

It's important to note that the other options provided are not related to the reaction given and are not accurate.

Answer:

Freezing point. The known colligative properties of a solution are freezing point depression, osmotic pressure, vapor pressure lowering, and boiling point elevation.

Freezing refers to the phase change of a substance from the liquid state to a solid-state. This is a phase change phenomenon which means that a substance is transformed from one state of matter to another state.

The change in the liquid to the solid phase at a constant temperature is called freezing. The temperature at which liquid changes to solid is called the freezing point. Example: water-filled in an ice cube tray, when kept in the freezer, changes into solid, so here the water freezes to form ice cubes.

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The energy of activation is given by the energy of the activated complex minus the energy of the reactants. So the answer is d-the activated complex minus the energy of the reactants.

The rate of any reaction relies on the temperature at which it is running. As there is an increase in the temperature, the molecules move faster and therefore slam with each other more frequently. The moving molecules also hold more kinetic energy.

Enzymes affect the activation energies and lowers it. Enzymes lower the activation energy essential to convert a reactant into a product.

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The limiting reactant for each amount of reactants in the reaction 2Na(s) + Br₂(g) -> 2NaBr(s) can be determined by comparing the number of moles of each reactant to the balanced equation and identifying which reactant runs out first. option B to D.

The limiting reactant (or limiting reagent) is the reactant that is consumed first in a chemical reaction, limiting the amount of product that can be formed.

a) 2 mol Na, 2 mol Br₂:

The balanced equation states that for every 2 moles of Na, 2 moles of Br₂ are required. Since the amount of Na and Br₂ are the same, either one could be the limiting reactant.

b) 2.5 mol Na, 1 mol Br₂:

The balanced equation states that for every 2 moles of Na, 2 moles of Br₂ are required. Since there is only 1 mol of Br₂ and 2.5 mol of Na, Br₂ is the limiting reactant.

c) 1.8 mol Na, 1.4 mol Br₂:

The balanced equation states that for every 2 moles of Na, 2 moles of Br₂ are required. Since there is only 1.4 mol of Br₂ and 1.8 mol of Na, Br₂ is the limiting reactant.

d) 12.6 mol Na, 6.9 mol Br₂:

The balanced equation states that for every 2 moles of Na, 2 moles of Br₂ are required. Since there is only 6.9 mol of Br₂ and 12.6 mol of Na, Br₂ is the limiting reactant.

In summary, the limiting reactant is the one that runs out first, and the amount of product formed will be limited by the amount of limiting reactant present. In the reaction 2Na (s) + Br₂(g) -> 2 NaBr(s), Br₂ is always the limiting reactant.

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As the sample descended, a weighted balloon carrying an ideal gas sample with a capacity of 1.7 L and an atmospheric pressure of 1.00 atm was released.

22.41 L/mol

At STP (Std Pressure and Temperature = 0 °A and, 1 atm), how big is one mole of a thermodynamic ,equilibrium? Therefore, at STP, an ideal gas has a volume of 22.41 L/mol. The least important and most widely remembered chemical number is 22.4 L.

760 mm Hg equals 1 atm. However, the Pascal is the accepted pressure measurement unit around the world. 1 atm Equals 101325 Pa. Robert Boyle, an English scientist, carried out.

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The manganese compounds with manganese (II) cation are MnO, MnBr2, and Mn2S3 and with manganese (III) cation are MnN, Mn3P2, and MnI3.

Cations refers to the positively charged ions (atoms or groups of atoms that have more protons than electrons due to having lost one or more electrons) and anions refers to the negatively charged ions (atoms or groups of atoms that have more electrons than protons due to having gained one or more electrons). In order to determine if the manganese ion is manganese (II) or manganese (III), the anion bonded to it is considered. In MnN as N = -3 hence, so the cation is Mn (III). In MnO, O = -2 so the cation is Mn (II). In MnBr2, Br = -2 so the cation is Mn (II). In Mn2S3, S = -2 so cation is Mn (III). In Mn3P2, P = -3 so the cation is Mn (II). In MnI3, I = -3 so the cation is Mn (II).

Note: The question is incomplete. The complete question probably is: 1. Sort the following manganese compounds by whether the cation is manganese (II) or manganese (III).  MnN  MnO  MnBr2  Mn2S3  Mn3P2  Mnl3

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A student draws a distance verses time graph to describe the motion of a model train therefore the horizontal section of the graph indicates that  the train is moving with uniform velocity with no acceleration because there is no change in velocity.

This occurs when the average velocity between any two points along its path is the same in magnitude as well as direction.

If the velocity-time graph for the part of a journey is a horizontal line, then it simply means that the train is moving with uniform velocity with no acceleration because there is no change in velocity thereby making it the correct choice.

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The weight of the salt that includes one mole of NH3 is 82.44 g salt.

The International System for Units uses the mole (symbol: mol) as the unit of material quantity. How many basic entities of a particular substance are present in an item or specimen is determined by the quantity of that material.

The extra moles of HCl titrated with NaOH are first calculated. Normality and molarity is same for both NH3 and HCl.

So, 0.1262 N NaOH = 0.1262 M NaOH and 0.1013 N HCl = 0.1013 M HCl

6.30 mL x (1L/1000mL) x (0.1262 mol/L) x (1mol HCl/1mol NH3) = 0.000795 mol HCl

Now, we would calculate the total moles of HCl added to the sample.

30.00 mL x (1L/1000mL) x (0.1013 mol/L) = 0.003039 mol HCl

moles of HCl used to react with the sample of nickel salt = 0.003039 - 0.000795 = 0.002244 mol

From given equation, HCl is used to neutralize the ammonia present in the nickel salt and there is 1:1 mol ratio between them.

So, moles of NH3 present in the salt = 0.002244 mol

0.002244 moles of NH3 are present in 0.185 g of the sample. We need to calculate the grams of salt that would have 1 mol of NH3.

1 mol NH3 x (0.185 g salt/0.002244 mol NH3) = 82.44 g salt

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It is accurate to state the following. Temperature is unaffected by a phase change. As a result, choice c) is accurate.

Phase transition is the process by which a substance transforms from one state—solid, liquid, or gas—to another. Every substance and substance has a precise range of temperatures and pressures at which it can change by one phase to another.

Energy changes are physical processes that cause a material to change its phase. The transformation frequently occurs at a particular temperature, usually known as the drug's melting or boiling point, as heat is used or removed.

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The Complete Question :

During a phase change, the temperature of a substance

a. increases

b. decreases

c. does not change

d. increases or decreases

The correct statement is: temperature is unaffected by a phase change.

As a result, during a phase change temperature does not change, this option is correct.

Phase transition is the process by which a substance transforms from one state—solid, liquid, or gas—to another. Every substance and substance has a precise range of temperatures and pressures at which it can change by one phase to another.

Energy changes are physical processes that cause a material to change its phase. The transformation frequently occurs at a particular temperature, usually known as the drug's melting or boiling point, as heat is used or removed.

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Answer and Explanation for Question 3

The volume of H₂S needed to neutralize 45 mL of NH₂⁻ is 30 mL. Thus, the correct answer would be B.

To calculate this, we need to use the stoichiometric equation.  First, we find the moles of NH2- present in the solution: 45 mL × 0.80 M = 0.036 moles. Then, we need to find the moles of H2S needed to neutralize this, which is equal to the moles of NH2- since the reaction is 1:1. Therefore, we need 0.036 moles of H2S. To convert this to volume, we need to divide by the molarity of the H2S solution: 0.036 mol/1.2 M = 0.03 L, or 30 mL.

Answer and Explanation for Question 4:

The indicator most appropriate for this reaction would be phenolphthalein. Thus, the correct answer would be D.

In this acid-base titration, a solution of HCl is added to an unknown concentration of a base, with the initial pH of the solution being approximately 10. As HCl continues to be added to the mixture, the pH remains relatively unchanged until 50 mL of HCl have been added, at which point the pH of the mixture drops sharply to approximately 3, indicating that the equivalence point has been reached.

Indicators can help us detect the equivalence point of a titration. Phenolphthalein changes color from pink to colorless when the pH of the mixture drops below 8.3, which is what happens in this reaction. Therefore, phenolphthalein would be the most appropriate indicator for this reaction.

It takes 1 mol of sulfur to produce 1 mol of sulfur dioxide. Therefore, 64 g of sulfur is required to produce 64 g of sulfur dioxide.

To calculate the mass of sulfur required to produce 64 g of sulfur dioxide, the following equation can be used:

m (sulfur) = (64 g SO2) / (32 g/mol SO2) × (1 mol S/ 32 g S) = 2 mol S

Therefore, the mass of sulfur required to produce 64 g of sulfur dioxide is 2 mol S or 64 g.

The mass of sulfur that must be burned to produce 64 g of sulfur dioxide is 64 g. This is because the molar mass of sulfur dioxide is 32 g/mol and the molar mass of sulfur is 32 g/mol.

Therefore, it takes 1 mol of sulfur to produce 1 mol of sulfur dioxide. Therefore, 64 g of sulfur is required to produce 64 g of sulfur dioxide.

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The conversion of the kJ to calorie is :

2.75 × 10⁴ kJ =  6.572 × 10⁶ cal

The conversion is given as :

The kilojoules and the calories both are the unit that will measures the energy. The energy is measure in the kilojoules, kJ.

1) kJ to J

2.75 × 10⁴ kJ = 2.75 × 10⁴ × 1000

                       = 2.75 × 10⁷ J

2) J to calorie

2.75 × 10⁷ J  = 2.75 × 10⁷ × 0.239

                     = 6.572 × 10⁶ cal

Thus, the kJ to the cal conversion is 2.75 × 10⁴ kJ =  6.572 × 10⁶ cal.

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Only particles in solution react during taste perception, which is also influenced by scent, appearance, and temperature.

How do umami, bitter, and sweet taste cells get activated?

G protein-coupled proteins (GPCRs) from the T1R and T2R groups are activated on tasting receptor cells to release the bitter, umami, and sweet sensations that mammals detect.

What causes the perception of sweetness?

The brain's neurological pathways for interpreting and responding to sweet stimuli are activated when sweet endings in the mouth—which are involved in the experience of sweet taste—are stimulated with either nutritional sweeteners or LCS.

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the types of glycine present there in solution and the amount of each kind in the solution, and the pka of both the NH2 group, which ranges from 9 to 78, determines the solution's pH at 3. pH = equiv = 9.78, then.

What is the benefit of glycine?

A picture of glycine

The amino acid glycine has a host of remarkable health advantages. To produce crucial substances like glutathione, creatine, and collagen, your body needs glycine. Additionally, this amino acid may enhance heart health and sleep quality while defending your liver from alcohol-related harm.

Who should avoid glycine intake?

Avoid consuming excessive dosages of a single amino acid over an extended period of time. Avoid using single amino acids in excessive dosages without first consulting a healthcare professional. It is not advised for women to take glycine supplements when they are expecting or nursing.

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Electron affinity increases going left to right across a period because of increased nuclear attraction.

The amount of energy released when an electron is added to a neutral atom to create a negatively charged ion is known as electron affinity in chemistry. Only a few chemical elements, mostly the halogens, have values for the electron affinities of their atoms since it is difficult to test these properties.

The atom's nucleus becomes increasingly positively charged as the number of protons increases. The stronger the positive charge, the more the atom's nucleus and electrons are drawn together. As a result, the nucleus is able to hold the electrons more tightly, enhancing electron affinity.

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The Double displacement reaction is the reaction in which the reacting substances  react and exchange the ions and  forms the new product.

The The Double displacement reaction is the reaction in which the reacting substances  react and exchange the ions and  forms the new product. The positive ions exchange the negative ions. The general examples is given as :

A⁺B⁻  +   C⁺D⁻   ---->   A⁺D⁻  +  C⁺B⁻

In the double displacement reaction one of the product is :

AgNO₃(aq)  +  NaCl(aq)  ---->  AgCl(s)  +  NaNO₃(aq)

HNO₃(aq)  +  KOH(aq)   ---->    KNO₃(aq)   +  H₂O(l)

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